JUnit – 编写测试

六、JUnit – 编写测试

在这里你将会看到一个应用 POJO 类，Business logic 类和在 test runner 中运行的 test 类的 JUnit 测试的例子。

在 C:\ > JUNIT_WORKSPACE 路径下创建一个名为 EmployeeDetails.java 的 POJO 类。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
public class EmployeeDetails {

   private String name;
   private double monthlySalary;
   private int age;

   /**
   * @return the name
   */
   public String getName() {
      return name;
   }
   /**
   * @param name the name to set
   */
   public void setName(String name) {
      this.name = name;
   }
   /**
   * @return the monthlySalary
   */
   public double getMonthlySalary() {
      return monthlySalary;
   }
   /**
   * @param monthlySalary the monthlySalary to set
   */
   public void setMonthlySalary(double monthlySalary) {
      this.monthlySalary = monthlySalary;
   }
   /**
   * @return the age
   */
   public int getAge() {
      return age;
   }
   /**
   * @param age the age to set
   */
   public void setAge(int age) {
   this.age = age;
   }
}

EmployeeDetails 类被用于

  • 取得或者设置雇员的姓名的值
  • 取得或者设置雇员的每月薪水的值
  • 取得或者设置雇员的年龄的值

在 C:\ > JUNIT_WORKSPACE 路径下创建一个名为 EmpBusinessLogic.java 的 business logic 类

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
public class EmpBusinessLogic {
   // Calculate the yearly salary of employee
   public double calculateYearlySalary(EmployeeDetails employeeDetails){
      double yearlySalary=0;
      yearlySalary = employeeDetails.getMonthlySalary() * 12;
      return yearlySalary;
   }

   // Calculate the appraisal amount of employee
   public double calculateAppraisal(EmployeeDetails employeeDetails){
      double appraisal=0;
      if(employeeDetails.getMonthlySalary() < 10000){
         appraisal = 500;
      }else{
         appraisal = 1000;
      }
      return appraisal;
   }
}

EmpBusinessLogic 类被用来计算

  • 雇员每年的薪水
  • 雇员的评估金额

在 C:\ > JUNIT_WORKSPACE 路径下创建一个名为 TestEmployeeDetails.java 的准备被测试的测试案例类

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class TestEmployeeDetails {
   EmpBusinessLogic empBusinessLogic =new EmpBusinessLogic();
   EmployeeDetails employee = new EmployeeDetails();

   //test to check appraisal
   @Test
   public void testCalculateAppriasal() {
      employee.setName("Rajeev");
      employee.setAge(25);
      employee.setMonthlySalary(8000);
      double appraisal= empBusinessLogic.calculateAppraisal(employee);
      assertEquals(500, appraisal, 0.0);
   }

   // test to check yearly salary
   @Test
   public void testCalculateYearlySalary() {
      employee.setName("Rajeev");
      employee.setAge(25);
      employee.setMonthlySalary(8000);
      double salary= empBusinessLogic.calculateYearlySalary(employee);
      assertEquals(96000, salary, 0.0);
   }
}

TestEmployeeDetails 是用来测试 EmpBusinessLogic 类的方法的，它

  • 测试雇员的每年的薪水
  • 测试雇员的评估金额

现在让我们在 C:\ > JUNIT_WORKSPACE 路径下创建一个名为 TestRunner.java 的类来执行测试案例类

1
2
3
4
5
6
7
8
9
10
11
12
13
import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;

public class TestRunner {
   public static void main(String[] args) {
      Result result = JUnitCore.runClasses(TestEmployeeDetails.class);
      for (Failure failure : result.getFailures()) {
         System.out.println(failure.toString());
      }
      System.out.println(result.wasSuccessful());
   }
}

用javac编译 Test case 和 Test Runner 类

1
2
C:\JUNIT_WORKSPACE>javac EmployeeDetails.java 
EmpBusinessLogic.java TestEmployeeDetails.java TestRunner.java

现在运行将会运行 Test Case 类中定义和提供的测试案例的 Test Runner

1
C:\JUNIT_WORKSPACE>java TestRunner

检查运行结果

1
true